248 Kansas Academy of Science. 



COPALIS ROCK RESERVATION. 



Of the Copalis Rock reservation Willoughhy Rock covers ap- 

 proximately three acres. It is off shore about one mile, longitude 

 124° 21/ 22'/ west, latitude 47° 24/ 40'' north. It is 125 feet in 

 height. It is capped with a metamorphic conglomerate rock, 

 over which there is a thick earth-guano cap. It is climbable on the 

 Bouth, inaccessible on all other faces on account of its vertical 

 walls. It is grassed over and is an excellent nesting place for birds. 



Split Rock (which the Indian tradition says is the pair of tongs 

 which the creator Kwatte hurled into the sea in his rage when his 

 brother changed himself into a hermit crab), is about an acre in 

 area. It is off shore about a mile, longitude 125° 21' 45'' west, lati- 

 tude 47° 24' 20" north. It is a barren double rock composed of 

 conglomerate to metamorphic breccia of Cretaceous age. Its north- 

 ern slope is covered with small holes that usually contain water. 

 On the whole it presents a rough surface. In height it exceeds 

 eighty feet. It is an elegant rookery. 



Grenville Pillar is an unaccessible, grass-covered, earth-topped 

 island of about a quarter of an acre in area, just off of Point Gren- 

 ville (at Tohola), longitude 124° 17' west, latitude 47° 18' 20" 

 north. It is perpendicularly walled, except at the north, where 

 it is under-cut. Seven species of birds nest on it. 



Grenville Arch is a large rock off shore about a half mile south- 

 west from Point Grenville. It is conical-oval in shape, is perpen- 

 dicular on the east and north and is sloping on the west and south. 

 As the name signifies, it is tunneled through the middle part by 

 a wide arch, said to be forty feet in height. Seven bird species 

 also inhabit this island in summer. 



Erin's Bride is off shore 300 yards. It is situated to the 

 southeast of Point Grenville, in longitude 124° 16' west, latitude 

 47° 18' north. It is an unscalable, narrow rock. It is 125 feet in 

 height and aggregates one-half acre in area. It is covered with 

 fresh guano. 



Erin islet is near the last, and off shore about 200 yards. In 

 area it covers about two acres. It is 125 feet in height and is 

 climbable only on its north side. On top it is curb-roof shaped, 

 with top sloping east, west and north. On its earth cap grows a 

 dense mass of wire grass.^ 



Besides the above-named islands and groups of islands, there are 



3. Location and elevation of islands taken in the main from Coast and Geodetic Survey 

 Chart No. 6400. 



